식물정화공법에서 다양한 중금속의 식물체로의 흡수 및 축적 특성 비교: 식물체 종류, 중금속 종류, 토양 내 중금속 농도를 중심으로

정슬기,김태성,문희선,Jeong, Seul-Ki,Kim, Tae-Sung,Moon, Hee-Sun 한국지하수토양환경학회 2010 지하수토양환경 Vol.15 No.3

Phytoextraction, one type of phytoremediation processes, has been widely used in the removal of heavy metals from polluted soil. This paper reviewed literature on metal uptake by plants and characterized the metal uptake by types of metals (Zn, Cu, Pb, Cd, and As), plant species, initial metal concentrations in soil and the distribution of metals in different parts of plants. The potential of metal accumulation and transport by plants was closely related to plants species, types of metals, and initial metal concentrations in soil. The plants belonging to Brassicaceae, Solanaceae, Poaceae, and Convolvulaceae families have shown the high potential capacity of Cd accumulation. The Gentianaceae, Euphorbiaceae, and Polygonaceae families have exhibited relatively high Pb uptake potential while the Pteridaceae and Cyperaceae families have shown relatively high Zn uptake potential. The Pteridaceae family could uptake a remarkably high amount of As compared with other plant families. The potential metal accumulation per plant biomass has increased with increasing initial metal concentration in soil up to a certain level and then decreased for Cd and Zn. For As, only Pteris vittata had a linear relationship between initial concentration in soil and potential of metal uptake. However, a meaningful relationship for Pb was not found in this study. Generally, the plants having high metal uptake potential for Cd or Pb mainly accumulated the metal in their roots. However, the Euphorbiaceae family has accumulated more than 80% of Pb in shoot. Zn has evenly accumulated in roots and stems except for the plants belonging to the Polygonaceae and Rosaceae families which accumulated Zn in their leaves. The Pteridaceae family has accumulated a higher amount of As in leaves than roots. The types of metals, plant species, and initial metal concentration in soil influence the metal uptake by plants. It is important to select site-specific plant species for effective removal of metals in soil. Therefore, this study may provide useful and beneficial information on metal accumulation by plants for the in situ phytoremediation.

화학적 추출법에 따른 (구)장항제련소 주변 토양의 중금속 오염특성 분석과 식물 전이 가능량 예측

정슬기,안진성,김영진,김건하,최상일,남경필,Jeong, Seul-Ki,An, Jin-Sung,Kim, Young-Jin,Kim, Geon-Ha,Choi, Sang-Il,Nam, Kyoung-Phile 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.1

Potential risk of heavy metals to various receptors including humans depends on the bioavailability of the heavy metals in soil. In this study, the heavy metal extraction methods using 0.1N HCl and aqua regia were compared with the Tessier's sequential extraction method to assess whether these two methods can be used to determine the plant-available heavy metal concentrations. The contamination characteristics of copper (Cu), cadmium (Cd), lead (Pb), and arsenic (As) found in soils collected from 75 sites around the closed Janghang smelter were analyzed by extracting heavy metals using 0.1 N HCl, aqua regia, and the Tessier's sequential extraction method. The portion of metals bioavailable to plants is considered as the sum of the fraction 1 (exchangeable) and the fraction 2 (carbonates binding) of the Tessier's 5-step sequential extraction method, which were determined to be 3.1 ${\pm}$ 3.82, 0.6 ${\pm}$ 0.15, 20.6 ${\pm}$ 18.78, and 7.0 ${\pm}$ 6.48 mg/kg for Cu, Cd, Pb, and As, respectively, in this study. When the extraction using aqua regia and the Tessier's extraction method were compared, the extracted Cu and Pb concentrations did not show significant differences, whereas the extracted Cd and As concentrations showed significant differences. These results indicate that the portion of Cd and As in the fraction 5 of the Tessier's sequential extraction can not be extracted using aqua regia. Using aqua regia, which is the official test method, higher concentrations of Cu, Cd, Pb and As were extracted than the sum of the fraction 1 and 2. The results show that only 9, 40, 39 and 10% of Cu, Cd, Pb and As using aqua regia can be uptaken by plants (i.e., plant-available). Using 0.1N HCl, the portion of Cd equivalent to about 66% the fraction 1 could be extracted, while, with Pb, the portion of the fraction 1 and about 90% of the fraction 2 could be extracted. With As, the portion equivalent to the fraction 1, 2 and 79% of the fraction 3 was extracted, while with Cu, the portion equivalent to the fraction 1, 2, 3 and 20% of the fraction 4 was extracted using 0.1N HCl.

기상이변에 대응하는 차세대 장경간 비닐하우스 구조시스템 제안

정시정(Jeong, Si-Jeong),정슬기(Jung, Seul-Ki),김현진(Kim, Hyun-Jin),최재혁(Choi, Jae-Hyouk) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2

Weather disaster-triggering damage to agricultural facilities in Korea is repeated year after year. Accordingly, anti-disaster technologies must be urgently developed for the secure and safe operation of farm household facilities. Recently, agricultural facilities have been requiring large-scale facilities for expanded productivity. In proposing new facilities, reviews should be carried out regarding their level of technology and the possibility of material supply by manufacturers in existing regions. In this paper, to propose a structural system for a low-cost future-generation pipe house with a long span, which will secure structural safety and large spaces in the existing construction environment.

Biotic ligand model에 근거한 중금속 오염지역의 Pb 및 Cd 위해오염도 평가기법 개발

안진성,정슬기,문희선,남경필,An, Jin-Sung,Jeong, Seul-Ki,Moon, Hee-Sun,Nam, Kyoung-Phile 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.4

Risk based pollution level of Pb and Cd in metal contaminated soils depending on physicochemical properties of soil in a target site was assessed using biotic ligand model. Heavy metal activity in soil solution defined as exposure activity (EA) was assumed to be toxic to Vibrio fischeri and soil organisms. Predicted effective activity (PEA) determined by biotic ligand model was compared to EA value to calculate risk quotient. Field contaminated soils (n = 10) were collected from a formes area and their risk based pollution levels were assessed in the present study using the calculated risk quotient. Concentrations of Pb determined by aqua regia were 295, 258, and 268 mg/kg in B, H and J points and concentrations of Cd were 4.73 and 6.36 mg/kg in G and I points, respectively. These points exceeded the current soil conservation standards. However, risk based pollution levels of the ten points were not able to be calculated because concentrations of Pb and Cd in soil solution were smaller than detection limits or one (i.e., non toxic). It was because heavy metal activity in soil solution was dominant toxicological form to organisms, not a total heavy metal concentration in soil. In addition, heavy metal toxicity was decreased by competition effect of major cations and formation of complex with dissolved organic carbon in soil solution. Therefore, it is essential to consider site-specific factors affecting bioavailability and toxicity for estimating reliable risk of Pb and Cd.

전남 일부 지역 대학생 손의 미생물 오염도와 위생 인식

김종명 ( Jong-myeong Kim ),정슬기 ( Seul-ki Jeong ),강석호 ( Suk-ho Kang ),권순목 ( Sun-mok Kwon ),김중범 ( Jung-beom Kim ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.2

The purpose of this study was to compare hand washing awareness and microorganism contamination on the hands for evaluating the difference between awareness and conditions of hand hygiene. The average number of total aerobic bacteria and coliform was 2.7 log CFU/hand and 1.8 log CFU/hand, respectively. Coliform bacteria were detected in all of the students tested in this study. The questionnaire survey data obtained via a direct interview were collected from 100 university students with microorganism analysis. A majority (90%) of the students recognized that good hand hygiene is important in order to prevent food poisoning. In the hand washing survey data, the responses suggesting “always washed” from “before eating food”, “after handling money”, “after finishing study” and “after visiting patients” were observed in 18, 13, 15 and 33 out of the 100 students, respectively. The questionnaire data of hand washing frequency and time duration showed that 14 students and 6 students answered “more than 8 times of hand washing per day” and “more than 30 seconds of hand washing time”, respectively. These results indicated that improper hand washing practices and poor hand hygiene were identified in the majority of the students. This emphasizes the difference between awareness and conditions of hand hygiene. Repeated hand washing education about the frequency, time duration and methods is constantly required to improve hand hygiene. Installation of hand washing equipment in the space of a restaurant and cafeteria is suggested for enhancing hand hygiene before eating food.

書體의 數理科學的 分析 : 行列을 利用한 알고리듬의 開發

백헌기(Baek, Hun-ki),정슬기(Jeong, Seul-gi),김동석(Kim, Dong-seok) 한국서예학회 2010 서예학연구 Vol.17 No.-

본 논문의 내용은 書體의 數理科學的 分析이다. 行列을 이용한 알고리듬을 開發하고, 개인 펜글씨체와 한글 붓글씨체의 書體認識에 적용하여 수학적 근거를 가지는 판정을 한다. 서체인식은 현대문명의 여러 신분확인 방법 중 그 중요성이 가장 클 뿐만 아니라, 여러 가지 다른 활용을 가지므로, 다양한 방법론이 개발되고 있다. 본 논문에서는 代數學의 한 분야인 線型代數學의 가장 중요한 연구방법인 行列을 이용하여 書體에 따라 다른 값을 대응하는 알고리듬을 개발한다. 알고리듬을 개발하기 위하여 먼저 컴퓨터에 私用되고 있는 다양한 폰트에 대하여, 글자의 크기, 스캔한 글씨의 해상도, 크기보다는 書體 자체에 따라 분류 가능한 行列의 不變量으로 행렬의 固有値 절댓값의 최댓값인 스팩트랄 반경(spectral radius)을 찾고, 이를 효율적으로 다루는 알고리듬을 찾는다. 개발된 수학적 알고리듬의 응용으로 개인 펜글씨체와 한글 붓글씨체로 昌德宮‘樂善齋’에 수집되어 왕실에서 널리 읽혔던 소설 ‘洛城飛龍’과 궁체가 가장 발달하 였던 1800년을 전후한 英?正祖時代에 필사된 작품으로, 우아하면서도 정중하고 깊은 의지가 담겨 있는 正字와 뛰어난 視覺美를 갖추고 있는 흘림으로 쓰여진 한글 長篇小說 ‘옥원듕회연’을 다루어 효과적으로 書體를 인식함을 발견한다. 본 연구의 목적 중 하나인 漢字로 쓰여진 書體의 분류는 개발된 알고리듬이 흘림체에 대하여 여러 가지 문제점을 나타내고 있어서 효과적으로 수행치 못한다. 단순한 스캔에 의한 데이터로의 수리과학적 분석만으로는 불가능하지만, 서예학자의 공동연구로 방법론이 쇄신된다면 이 문제점을 극복하리라 기대한다. The main theme of the article is scientific and mathematical analysis of calligraphy. We develop an algorithm using matrix theory and we find the decision based on mathematical reason by applying the algorithm for personal hand writing and Hangul traditional brush calligraphy. The calligraphic recognition not only is one of the most important method for modern personal identification but also has many different useful application so there are many ongoing research for methodology for the calligraphic recognition. We mainly use matrix which is the most valuable tool in linear algebra to find an algorithm to produce a numerical invariant depend on calligraphy itself. To develop such an algorithm, we examine the spectral radius of the permanent matrix induced by the scanned image of letters depend on the size, the font, resolution. After obtaining algorithm, we find applications for personal hand writing and letters from a popular novel "NackSeongBiRyong" and "OkWonDyungHoiYeon" in Chosun dynasty. We find that our algorithm successfully recognize the difference of letters of different person and find the consistency of letters written by one person. The original purpose of this research was to find an algorithm that really recognize the chinese characters. But our algorithm does not work some of chinese characters especially cursive writing. To overcome this problem, we are looking after several possible methodologies based on differential geometry, dynamics and statistics. However, we expect the real answer can not be found without a help of calligraphy scholar.

실제 혈관 형상 및 혈액 특성을 고려한 경동맥 내 혈액 유동에 대한 수치해석 연구

이상혁(Sang Hyuk Lee),정슬기(Seul-Ki Jeong),허남건(Nahmkeon Hur),조영일(Young Il Cho) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5

In the present study, the characteristics of blood flow inside a carotid artery numerically investigated with shear rate specific blood viscosity. To simulate the blood flow with a patient-specific arterial geometry, the geometry of a carotid artery was constructed from 2D rain MRA data. The measured data of blood flow velocity at the common carotid artery were used as boundary conditions of the simulation. For the blood rheology data to be used in the simulation, the patient specific blood viscosity over the whole ranges of shear rate was obtained using BioVisco<SUP>TM</SUP>. From the numerical results of the blood flow in the carotid artery, the increase of blood viscosity and the decrease of wall shear stress could be found in the carotid bifurcated region, more specifically at the post-plaque dilated region. These characteristics of blood viscosity and wall shear stress can be used more precisely and efficiently to predict the region vulnerable to plaque growth or thrombosis on top of the plaque.

뇌기저동맥부 뇌경색 예측을 위한 혈액유동 해석 연구

이상혁(Sang Hyuk Lee),정슬기(Seul-Ki Jeong),허남건(Nahmkeon Hur),조영일(Young Il Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4

경동맥 내중막 두께 및 죽종과 심 혈관 질환 위험요인과의 관련성

이영훈,최련화,신민호,권순석,박경수,정슬기,정은경,최진수,Lee, Young-Hoon,Cui, Lian-Hua,Shin, Min-Ho,Kweon, Sun-Seog,Park, Kyeong-Soo,Jeong, Seul-Ki,Chung, Eun-Kyung,Choi, Jin-Su 대한예방의학회 2006 예방의학회지 Vol.39 No.6

Objectives : This study was conducted to examine the association between the carotid artery intima-media thickness (IMT), plaque and cardiovascular risk factors according to gender and age. Methods : The data used for this study were obtained from 1,507 subjects (691 men, 816 women), aged 20-74 years, who participated in 'Prevalence study of thyroid diseases' in two counties of Jeollanam-do Province during July and August of 2004. The body mass index (BMI) and waist hip ratio (WHR) were calculated by anthropometry The blood pressure, pulse rate, pulse pressure, total cholesterol, triglyceride, HDL cholesterol and fasting blood sugar level were also measured. Ultrasonography was used to measure the carotid artery IMT and plaque. IMT measurements were performed at 6 sites, including both common carotid arteries, and the bulb and internal carotid arteries. The definition of the 'mean IMT' was mean value obtained from these 6 sites. Results : The ${\pm}$ standard deviation IMT values were $0.65{\pm}0.14\;and\;0.60{\pm}0.13mm$ in men and women (p<0.001), respectively. The data were analyzed according to gender and the 50 year age groups. In a multiple linear regression analysis, age and hypertension were positively associated with the mean IMT in both men and women, aged<50 years. Age, total cholesterol and smoking (current) were positively associated with the mean IMT in men $(\geq50\;years)$. Age was positively associated with the mean IMT in women $(\geq50\;years)$, but the HDL cholesterol level was negatively associated. The prevalence of plaques was 44.2%(196/443) in men and 19.4%(89/459) in women, for those greater than 50 years of age. In a multiple logistic regression analysis, age (OR=1.090, 95%CI=1.053-1.129), HDL cholesterol (OR=0.964, 95%CI=0.944-0.984), total cholesterol (OR=1.009, 95%CI=1.002-1.017)and BMI (OH=0.896, 95%CI=0.818-0.983) were independently associated with plaques in men; whereas, age (OR=1.057, 95%CI=1.012-1.103), HDL cholesterol (OR=0.959, 95%CI=0.932-0.986), pulse pressure (OR=1.029, 95%CI=1.007-1.050) and triglycerides (OR=0.531, 95%CI=0.300-0.941) were independently associated with plaques in women. Conclusions: There were significant gender and aging differences in the association between the IMT, plaque and cardiovascular risk factors. Therefore, for the prevention of atherosclerosis, selective approaches should be considered with regard to gender and age factors.

공복혈당과 당화혈색소에 의한 당뇨병 진단 비교

윤우준,신민호,권순석,박경수,이영훈,남해성,정슬기,윤용운,최진수,Yun, Woo-Jun,Shin, Min-Ho,Kweon, Sun-Seong,Park, Kyeong-Soo,Lee, Young-Hoon,Nam, Hae-Sung,Jeong, Seul-Ki,Yun, Yong-Woon,Choi, Jin-Su 대한예방의학회 2010 Journal of Preventive Medicine and Public Health Vol.43 No.5

Objectives: The American Diabetes Association (ADA) has recently recommended the HbA1c assay as one of four options for making the diagnosis of diabetes mellitus, with a cut-point of $\geq$ 6.5%. We compared the HbA1c assay and the fasting plasma glucose level for making the diagnosis of diabetes among Korean adults. Methods: We analyzed 8710 adults (age 45-74 years), who were not diagnosed as having diabetes mellitus, from the Namwon study population. A fasting plasma glucose level of $\geq$126 mg/dL and an A1c of $\geq$ 6.5% were used for the diagnosis of diabetes. The kappa index of agreement was calculated to measure the agreement between the diagnosis based on the fasting plasma glucose level and the HbA1c. Results: The kappa index of agreement between the fasting plasma glucose level and HbA1c was 0.50. Conclusions: The agreement between the fasting plasma glucose and HbA1c for the diagnosis of diabetes was moderate for Korean adults.